JC
John Callahan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cerro Gordo, Iowa
Our Model Tree links this John Callahan across the 1930 and 1940 US Censuses in Cerro Gordo, Iowa (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 10-person household.
Age 2
b. ~1928
Male
Son
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cerro Gordo, Iowa |
| Surname | Callahan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Additional Details | |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Dougherty Township |
| Est. Birth Year | ~1928 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Bernadine Callahan | Daughter | — | ~1930 | |
| Mary Callahan | Daughter | — | 10 | ~1920 |
| Jacqueline Callahan | Daughter | — | 9 | ~1921 |
| Rose Callahan | Daughter | — | 14 | ~1916 |
| Fred Callahan | Head | — | 41 | ~1889 |
| Gerald Callahan | Son | — | 4 | ~1926 |
| John Callahan | Son | — | 2 | ~1928 |
| Ambrose Callahan | Son | — | 12 | ~1918 |
| Patricia Callahan | Son | — | 16 | ~1914 |
| Lea Callahan | Spouse | — | 39 | ~1891 |
Census Appearances
1930
Cerro Gordo, …
Son, age 2
Cerro Gordo, Iowa · implied b. ~1928 — 10 household members
| Surname | Callahan |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cerro-Gordo-County, Iowa
Son, age 12
Cerro-Gordo-County, Iowa · implied b. ~1928 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Calahan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Cartersville |
| 1935 Residence (County) | Cerro Gordo |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Callahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Callahan
Son · 1930 · age 2 · b. ~1928 · Iowa
★ You are viewing this record
Sibling
Bernadine Callahan
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Callahan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jacqueline Callahan
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patricia Callahan
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Callahan
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Gerald Callahan
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ambrose Callahan
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Cerro Gordo, Iowa
Open full size
1930 US Federal Census — Cerro Gordo, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel647:0686)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Helen Harms | 36 | Wife | — | Germany |
| 52 | Lloyd G. Harms | 13 | Son | — | Montana |
| 53 | Emma A. Harms | 10 | Daughter | — | Iowa |
| 54 | Raymond J. Harms | 5 | Son | — | Iowa |
| 55 | Ralph L. Harms | 5 | Son | — | Iowa |
| 56 | Charlie Riedel | 46 | Boarder | Tiler | Iowa |
| 57 | William M. Reed | 73 | Head | Farmer | Iowa |
| 58 | Mary Ann Reed | 65 | Wife | — | Iowa |
| 59 | Ella Reed | 34 | Daughter | — | Iowa |
| 60 | Thomas Reed | 31 | Son | Laborer | Iowa |
| 61 | Anna Reed | 28 | Daughter | — | Iowa |
| 62 | James Cooling | 27 | Boarder | Laborer | Illinois |
| 63 | George Wiegand | 56 | Head | Farmer | Germany |
| 64 | Emma Wiegand | 23 | Son | Laborer | Iowa |
| 65 | Melvin M. Logan | 48 | Head | Farmer | Iowa |
| 66 | Susie C. Logan | 38 | Wife | — | Iowa |
| 67 | Agnes C. Logan | 16 | Daughter | — | Iowa |
| 68 | Donald M. Logan | 15 | Son | — | Iowa |
| 69 | Mildred B. Logan | 14 | Daughter | — | Iowa |
| 70 | Delores M. Logan | 11 | Daughter | — | Iowa |
| 71 | Robert J. Logan | 9 | Son | — | Iowa |
| 72 | Martin A. Logan | 7 | Son | — | Iowa |
| 73 | Emmett M. Logan | 4 | Son | — | Iowa |
| 74 | Clarence H. Worley | 23 | Head | Farmer | Iowa |
| 75 | Annie A. Worley | 24 | Wife | — | Iowa |
| 76 | Geraldine Worley | 2 | Daughter | — | Iowa |
| 77 | Dorothy Worley | 1 | Daughter | — | Iowa |
| 78 | Melvin Edmond | 35 | Head | Farmer | Iowa |
| 79 | Thomas J. Edmond | 70 | Father | Mail Carrier | Wisconsin |
| 80 | Melvin L. Edmond | 25 | Brother | — | Iowa |
| 81 | George Zandersburg | 35 | Head | Farmer | Iowa |
| 82 | Katherine Zandersburg | 37 | Wife | — | Iowa |
| 83 | Ruford J. Zandersburg | 12 | Son | — | Iowa |
| 84 | George C. Zandersburg | 11 | Son | — | Iowa |
| 85 | Mary L. Zandersburg | 9 | Daughter | — | Iowa |
| 86 | Betty Zandersburg | 8 | Daughter | — | Iowa |
| 87 | Margaret Zandersburg | 7 | Daughter | — | Iowa |
| 88 | Ruth A. Zandersburg | 5 | Daughter | — | Iowa |
| 89 | Frances Zandersburg | 4 | Daughter | — | Iowa |
| 90 | Patricia Zandersburg | 1 | Daughter | — | Iowa |
| 91 | Fred Callahan | 41 | Head | Farmer | Iowa |
| 92 | Lea G. Callahan | 39 | Wife | — | Iowa |
| 93 | Patricia H. Callahan | 16 | Son | — | Iowa |
| 94 | Rose A. Callahan | 14 | Daughter | — | Iowa |
| 95 | Ambrose Callahan | 12 | Son | — | Iowa |
| 96 | Mary E. Callahan | 10 | Daughter | — | Iowa |
| 97 | Jacqueline M. Callahan | 9 | Daughter | — | Iowa |
| 98 | Gerald Callahan | 4 | Son | — | Iowa |
| 99 | John J. Callahan THIS PERSON | 2 | Son | — | Iowa |
| 100 | Bernadine Callahan | 0 | Daughter | — | Iowa |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)